Previously, we required both or none of MOZ_SOURCE_REPO and
MOZ_SOURCE_CHANGESET to be defined. This logic was established in
51029f4d82d3 (bug 1247162).
There appears to be no good reason why we require MOZ_SOURCE_CHANGESET
if MOZ_SOURCE_REPO is defined. After all, if we have a checkout we should
be able to resolve the revision.
This commit changes the logic to resolve the changeset when not defined.
We still error if MOZ_SOURCE_REPO is defined but we can't resolve the
changeset. I can't imagine this breaking anything.
This change will be necessary to appease TaskCluster tasks once mozharness
is changed in a subsequent commit to define MOZ_SOURCE_REPO. Buildbot and
TC each have their own way of specifying the source revision. Rather than
change mozharness, it feels easier to just have the build system derive
things. This decision is further justified by the fact there is a chicken
and egg problem in mozharness: the environment variable dict is resolved
before source directory population. So, we'd need to teach mozharness
about TC's VCS mechanism, which it currently has no knowledge of. I'd rather
not do that.
MozReview-Commit-ID: ANaoGbPGWj2
--HG--
extra : rebase_source : fd09b282dc1d88478eb76e37796b210cccecaf3a
The behavior is not entirely idempotent (most notably for
buildconfig.html), but this can be improved later if necessary.
It is idempotent where it matters.
This allows to get rid of config/makefiles/rcs.mk and its uses.
